Explanation: Core energy contributes 10% to the total energy due to dislocation. It is of the order of 0.5 to 1.5 eV. In the core region, distortion is maximum.

Explanation: In edge dislocation atoms above slip plane, are in compression state and below in tension state. Therefore, it shows less symmetry than screw dislocation.

Explanation: Elastic strain energy of screw dislocation is lesser than that of edge dislocation for unit length. It is 2/3 times than that of edge dislocation. That’s why screw dislocations are more stable.

Explanation: Elastic energy of a dislocation is proportional to the square of Burgers vector. It is represented by Frank’s rule. Which is Eelastic ∝ b2.

Explanation: From Frank’s rule, Eelastic ∝ b2. Thus, with an increase in Burger’s vector, the energy of dislocation increases. Hence, the stability of dislocation decreases.

Explanation: The force required to bend the dislocation is τ = Gb/2R. Here G is shear modulus, b is Burgers vector and R is the radius.

Explanation: The region outside the core gives rise in elastic strain energy. Its contribution to the total energy is 90%. While core energy contributes only 10%.

Explanation: Eelastic = lGb2. Where l is length, G is shear modulus and b is Burgers vector. So elastic energy is proportional to length. Strain energy is generally expressed for unit length.

Here, G is shear modulus and b is Burgers vector. So line tension associated with dislocation is proportional to the square of Burgers vector.

Explanation: A dislocation can’t glide further when encounters obstacles. It can cross slip or climb. Thus it can change the slip plane.

Explanation: Stress required to bend dislocation is given as τ = Gb sinϴ/l. Here b is Burgers vector and G is the shear modulus of the material. As a distance between particles (l) increases, the shear stress required to bend dislocation decreases.